Foam Sprays of Plant Growth Regulating Chemicals on Rose Shoot Development at Cutback1

Abstract

Expanded foam sprays of (2-chloroethyl)phosphonic acid (ethephon), 6-(benzylamino)-9-(2-tetrahydropyran-yl)-9H-purine (PBA), and 6-benzylamino purine (BA) at 1000 and 2000 ppm applied at plant cutback increased the total number of flowering stems per plant and the number of stems from axillary buds within 30 cm of the bud union, compared with conventional sprays of the same chemicals and concentration. Sprays of plant growth regulators were most effective when applied at cutback, with less benefit from treatments 3 weeks before cutback or 1 or 3 weeks after cutback. No chemical or method of application effectively promoted shoot development from the bud union.

Influence of Benzyladenine, Trinexapac-ethyl, or Uniconazole Applications on Height and Tillering of Six Ornamental Grasses

“…This promotion of branching after BA applications has been reported in several species, including balsam fir Christmas tree [Abies balsamea (Little, 1985)], chamomile (Emongor et al, 2004), cone flower [Echinacea purpurea (Latimer and Freeborn, 2008)], hosta (Keever, 1994), poinsettia [Euphorbia pulcherrima (Padhye et al, 2008)], and rose [Rosa spp. (Carpenter, 1975)]. However, in this study, BA applications at 500 or 1000 mgÁL -1 did not increase tillering of the ornamental grasses compared to the controls, except in 'Toffee Twist' sedge.…”

“…Additionally, increased tillering can improve propagule yield of ornamental grasses propagated by divisions. Benzyladenine (BA) promoted branching of many dicotyledonous species (Carpenter, 1975;Emongor et al, 2004;Latimer and Freeborn, 2008;Little, 1985;Padhye et al, 2008) and hosta (Hosta spp. ), a monocotyledonous species (Keever, 1994), and TE applications increased tillering in turfgrasses (Erwin and Koski, 1998;Erwin et al, 2002).…”